This tool will let you use metadata, from any of the metadata listed within jAlbum, as the source for title, comment, keywords, rating, creator, copyright text and/or copyright url. Title, comment and keywords can be appended to existing data instead of replacing it. Any object that does not contain data, within the selected source metadata field, will not be affected - that is existing data is not overwritten.
It comes in two versions, the Groovy version is more flexible as you can copy and paste between the listed metadata and the tool. Full instructions and additional requirements for the Groovy version at RobM's external tools for jAlbum